Jonathan gresty



(No Model.) 2 sheets-sheet -1.

J- 1VIILLS.

STEAM BOILEB..

No. 423,792. Patented Mar. 18, 1890.

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STEAM BOILER.

ANo Model.)

Patented Mar. 18, 1890.

W/TNESSBS UNITED STATES PATENT OFFICE.

JOHNSON MILLS, OF PRESTIVICH, COUNTY OF LANCASTER, ENGLAND.

STEAM-BOILER.

` SPECIFICATION forming part of Letters Patent No. 423,792, dated March 18, 1890. Application filed November 19, 1889. Serial No. 830,849. (No model.) Patented in England August 31, 1888, No. 12,545.

This invention relatesto the formation of parts of the shell, and also the end plates, of steam and water drums in water-tube steamboilers.

The object of this invention is to construct said steam and water drums in such a manner that thepockets to whichare connected the severalnests of tubes of which water-tube steamboilers are composed may be formed of part or may otherwise constitute a part of the drum-shell and also of the end plates.

In order more clearly to describe this my invention, I have annexed hereunto two sheets of drawings. shown similar letters refer to similar parts.

On Sheet l Figure 1 is a side view of front end of steam and water drum constructed according to this invention. Fig. 2 is a transverse section of same on line A A. Fig. 3 is a View drawn transversely through the line C C, showing formation of drum-ring b in combination with pocket b. Fig. 4 is a side View, and Fig. v5 a vertical section, on lines D D, of the combined drum -ring b and pocket b. Fig. 6 is a sectional elevation of a modification. Fig. 7 is a side view of the rear end of steam and water drum. Fig. S is an end View of the same. Fig. 9 is a transverse view of the combined end plate and pocket. Fig. 10 is a side view. Fig. l1 isl avertical section on the line F F of Fig. 9.

In constructing a steam and water drum according to this invention I form angular rings Z2 and c in pairs, and eitherof mild steel or other suitable material. I' make these angular or fianged rings of the same diameter internally as the external diameter of steam and water drum a, in order that said rings may fit thereon and be riveted or otherwise secured to steam and wat-er drum, so as to form strengthening-rings'at the joint of the In the several viewsthereinV said drum. At the under side of rings band c, I form pockets b and c', either from plates which lnay be Welded to said rings, and which may be dished out or pressed, or by other suitable means constructed to the required shape. I rivet or otherwise join together the flanges b2 and c2, and by these means the combined rings b and c and pockets b and c' form part of shell of steam and Water drum a. I attach to pocket b the front headers of tubes e by means of ferrules or short connectingtubes d, which may be placed either inclined or horizontally, as shown on drawings, and thus permit the nipples to be readily examin ed from the outside of front end of-boiler.

I construct a pocketh,vin combination with the end plate h at rear end of steam and water drum a byshaping and bending a plate of mild steel or other suitable material to the required form and either riveting or Welding the joints. The end plate h may'either be dished or may be flat, 'as shown in drawings. I connect the back headers of tubes e to the pockets h by means of short circulating tubes or'nipples f,'whieh can be examined at the outside or rear end of boiler by removing the cap k opposite each tube. By these means increased strength in the upper steam and Water drum a is obtained and additional facilities for examination and repairs. The pockets b and c', in combination Withdrumrings b and c, and the pocket h', in combination with end plate h, may, when required, be formed at any other angle relatively with said drums, rings b and c, and end plate h than as shown on drawings.

V I deem it important that the pocket have a wall extending in line with the end plate, so

as to have a firm bearing against the part with which it comes in'contact, and also that the remaining sides be inclined, so as to form a tapered pocket whereby it Will be more firmly held in position and any tendency to settle Will only hold the pocketA more rigidly in place.

No claim is made herein to the construction shown on Sheet l of the drawings-that is, a steam drum provided with a depending pocket combined with independent headers independently connected to the pocket by nipples-as t-he same forms the subjectfmatter of my application, Serial No. 330,848, iled of other sides inelined'to give atapered'forni to [o even date' herewith. the pocket, asset forth.

Having now particularly described and as In testimony that I claim the foregoing I oertained the nature of my said invention and have hereunto set my hand this 1st day of 54 in what manner the same is to be formed, I de- A November, 1889.

Clare that what I claim is JOHNSON MILLS.

In'Water-tube steam-boilers, an end plate Vitnesses: 71, shaped to form a pocket h', with one side JONATHAN GRESTY.'

extended in line with the end plate and the THOMAS PRESCOTT. 

